Retrodiscal zone

Last revised by Dr Henry Knipe on 19 May 2014

The retrodiscal (bilaminar) zone is located between the posterior band of the TMJ disc and the posterior portion of the TMJ capsule. The 'bilaminar' refers to the two posterior attachments of the disc:

  • superior layer: elastic to allow anterior translation of the disc over the articular eminence
  • inferior layer (collagen): inelastic to maintain relationship with condyle

It also contains a small neurovascular bundle.

Related pathology

In TMJ inflammation, the retrodiscal area is a prominant site of edema.

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Cases and figures

  • Figure 1: labeled MRI
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  • Figure 2
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